No you don't have to reconfigure the UPS after battery replacement. However you may have to reset the battery Timer. There are 4 possible ways.1. Press and hold the fault reset button for 3-5 seconds2. Press and hold the fault reset and security key simultaneously for 3-5 seconds3. Press an dhold the fault and alarm silence buttons simultaneously for 3-5 seconds4. Cycle the logic Power. This means to remove power from the main processor.5. Call MGE. They have the software to reset the battery replacement alarm

you need an MGE expert engineer to check on the internal components, maybe the display by itself it dead can be replaced while UPS is on no problem. if you want to switch off the UPS you go for force shutdown but I cannot guarantee will restart if you do not fix the fault.